Best Thermos Flask for Keeping Drinks Hot of 2021: Top 6 Picks

Last update: 2021-01-16

In this ultimate buying guide, we are going to discuss in detail about how to choose the best thermos flask for keeping drinks hot. Without further ado, let’s dive right in:

Here are the best thermos flasks for keeping drinks hot (Jan 2021 Update):

  • Best Overall: Stanley Classic Vacuum Bottle 1.1QT
  • Best For Long Trips: Thermoflask Double Stainless Steel Insulated Water Bottle, 40 oz
  • Lightweight: DuraFlask Explorer Double-Wall Vacuum Insulated Water Bottle 32oz
  • Best For Short Trips: Fijoo Best Stainless Steel Coffee Thermos
  • Best For Hiking: MIRA 25 Oz Insulated Metal Water Bottle 12 Hours Hot
  • Best For Tea: Bear Grylls Triple Wall Vacuum Insulated Water Bottle
6 Best Thermos Flasks For Keeping Drinks Hot
Best Overall
Stanley Classic Vacuum Bottle 1.1QT
    Best For Long Trips
    Thermoflask Double Stainless Steel Insulated Water Bottle, 40 oz
      Lightweight
      DuraFlask Explorer Double-Wall Vacuum Insulated Water Bottle 32oz
        Best For Short Trips
        Fijoo Best Stainless Steel Coffee Thermos
          Best For Hiking
          MIRA 25 Oz Insulated Metal Water Bottle 12 Hours Hot
            Best For Tea
            Bear Grylls Triple Wall Vacuum Insulated Water Bottle

              Best Overall: Stanley Classic Vacuum Bottle 1.1QT

              Stanley Classic Vacuum Bottle 1.1QT
              Stanley Classic Vacuum Bottle 1.1QT
              10Perfect
              Pros
              • Safe and quality - rust-proof BPA-free 18/8 stainless steel material
              • Make your purchase more reliable - backed by a lifetime warranty
              • Fit different needs – three size options
              • Keep hot or cold drinks the longest time – 24 hours
              Cons
              • Expensive (but it’s frequently on a discount)

              Thermos flasks from Stanley have never let us down. They’re built to last, and importantly, your purchase is backed by a lifetime warranty.

              With this model, it’s no exception.

              While the whole body is constructed of rust-proof BPA-free 18/8 stainless-steel material for extreme longevity, it can keep your hot drinks up to 24 hours – the longest record. It also offers three size options: 1.1, 1.5, and 2 quarts.

              Besides, it has a collapsible handle for easy transportation and a spill-proof lid that also acts as an 8-ounce cup.

              Stanley Classic Vacuum Bottle 1.1QT Specifications

              Weight

              7.05 Ounces

              Size

              35.2/48/64 oz.

              Lid Type

              Insulated lid doubles as a cup

              Keeps Drinks Hot For

              24 hours

              Highlight Features

              rust-proof BPA-free 18/8 stainless steel material

              backed by a lifetime warranty

              three size options

              keep hot drinks up to 24 hours

              Standing out of the competition by the recorded 24-hour for keeping hot drinks, along with a lifetime warranty, the Stanley becomes our Best Overall Pick for 2020.

              Best For Long Trips: Thermoflask Double Stainless Steel Insulated Water Bottle, 40 oz

              Thermoflask Double Stainless Steel Insulated Water Bottle, 40 oz
              Thermoflask Double Stainless Steel Insulated Water Bottle, 40 oz
              10Perfect
              Pros
              • Fit in most hand sizes, backpack pockets, and cup holders – two sizes: 24 and 40 ounces
              • Allow for hands-free sipping or easy one-handed capability - newly improved straw lid
              • Ideal for long trips - keep hot drinks up to 12 hours & cold drinks up to 24 hours
              Cons
              • Not for kids – they will chew the top of the straw and ruin it
              • The straw lets lots of air through it

              The Thermoflask gives you two size options – 24 and 40 ounces, each of which can keep hot drinks up to 12 hours while the cold drink is 24 hours. It’s a more affordable option for long trips, especially if you’re in a tight budget.

              The spill-proof, dual-lid design gives you more peace in mind when storing it in your backpack, even if it’s accidentally dropped off the ground.

              A huge bonus for the newly improved straw for hands-free sipping or easy one-handed capability. Material: BPA-free stainless steel.

              Thermoflask Double Stainless Steel Insulated Water Bottle, 40 oz Specifications

              Weight

              1.74 pounds

              Size

              24 oz & 40 oz sizes

              Lid Type

              Chug and Straw Lid

              Keeps Drinks Hot For

              12 hrs.

              Highlight Features

              two sizes: 24 and 40 ounces

              newly improved straw lid

              keep hot drinks up to 12 hours & cold drinks up to 24 hours

              For the size, spill-proof lid design, and thermos duration, we find the Thermoflask to be perfect if you’re going to be on a long trip.

              Lightweight: DuraFlask Explorer Double-Wall Vacuum Insulated Water Bottle 32oz

              DuraFlask Explorer Double-Wall Vacuum Insulated Water Bottle 32oz
              DuraFlask Explorer Double-Wall Vacuum Insulated Water Bottle 32oz
              9.6Outstanding
              Pros
              • Durable yet lightweight - 18/8 stainless steel body and triple-layer thermos design & weight of 1.3 pounds
              • Able to keep hot/cold drinks for a long time – 12 hours for hot drinks and up to 28 hours for cold
              • Mess-free – secure flip cap lid design
              • Dependable – backed by a manufacturer’s 30-day money-back guarantee
              Cons
              • The other widow top is permanently attached to the lid
              • Not various size options
              • Require flipping up the cover to take a drink from the spout

              For most backpackers, the weight of their thermos flask does matter. For them, this ultra-lightweight option is worth trying due to its weight of only 1.3 pounds.

              It is able to hold 32 ounces of hot fluid (water, soup, or others) for 12 hours and 24-28 hours for cold drinks. An impressive performance!

              That’s a big thank you to the 18/8 stainless steel body and triple-layer thermos with a copper dip on the outermost of the internal double wall. The lid, on the other hand, is specifically designed for mess-free.

              To give you more confidence with your purchase, it is covered by a manufacturer’s 30-day money-back guarantee.

              DuraFlask Explorer Double-Wall Vacuum Insulated Water Bottle 32oz Specifications

              Weight

              1.3 pounds

              Size

              32oz

              Lid Type

              flip cap lid

              Keeps Drinks Hot For

              12 hours

              Highlight Features

              18/8 stainless steel body and triple-layer thermos design & weight of 1.3 pounds

              12 hours for hot drinks and up to 28 hours for cold

              secure flip cap lid design

              backed by a manufacturer’s 30-day money-back guarantee

              Looking to optimize the weight of your loads for backpacking? The DuraFlask is a fantastic solution to keep you hydrated while on the go without straining your backpack pocket.

              Best For Short Trips: Fijoo Best Stainless Steel Coffee Thermos

              Fijoo Best Stainless Steel Coffee Thermos
              Fijoo Best Stainless Steel Coffee Thermos
              9.2Outstanding
              Pros
              • Well-built, eco-friendly, and safe for human’s health – three-layer construction made of food-grade materials & a BPA-free lid
              • Prevent spillage and leakage - leak-proof new screw top lid design
              • Easy to use – the lid can be used as a drinking cup
              Cons
              • A bit hard to clean

              It’s no need to go for the most expensive thermos flask with the longest thermos duration if you just want it for a short trip.

              The Fijoo Best Stainless Steel Coffee Thermos is exactly what we’re trying to talk about, with 8 hours for hot drinks.

              Built to last, its construction has three layers – a copper lining sandwiched between two food-grade stainless-steel walls. Plus, a BPA-free leak-proof new screw top lid that can be used as a drinking cup.

              Fijoo Best Stainless Steel Coffee Thermos Specifications

              Weight

              12 ounces

              Size

              17 OZ/500ML

              Lid Type

              cup fixed to the lid

              Keeps Drinks Hot For

              8 hrs.

              Highlight Features

              three-layer construction made of food-grade materials & a BPA-free lid

              leak-proof new screw top lid design

              the lid can be used as a drinking cup

              The Fijoo Best Stainless Steel Coffee Thermos is our top suggestion for short trips, especially when considering its price.

              Best For Hiking: MIRA 25 Oz Insulated Metal Water Bottle 12 Hours Hot

              MIRA 25 Oz Insulated Metal Water Bottle 12 Hours Hot
              MIRA 25 Oz Insulated Metal Water Bottle 12 Hours Hot
              9.4Outstanding
              Pros
              • Lightweight and easy to carry – the weight of 1.21 pounds
              • Good thermos duration – 12 hours for hot and 24 hours for cold
              • Leak-proof and spill-proof – newly designed chug lid
              Cons
              • A bit hard to clean – narrow mouth
              • Anti-roll needs to be a little more

              For short hiking trips, we greatly suggest that you should use a lightweight, leak-proof flask that can keep hot drinks for at least 12 hours.

              Luckily, the MIRA 25 Oz Insulated Metal Water Bottle meets them all, even at an incredibly low price tag.

              It comes in two size options: 17 and 25 ounces to ensure fitting your specific needs and backpack pocket.

              Whichever of your choice, it is constructed of 18/8 stainless steel material with an innovative MiraGuard Technology application that can keep hot drinks up to 12 hours, and cold drinks within 24 hours with a sweat-free exterior.

              Last but not least, it’s backed by a one-year warranty.

              MIRA 25 Oz Insulated Metal Water Bottle 12 Hours Hot Specifications

              Weight

              1.21 pounds

              Size

              25 Oz

              Lid Type

              Chug lid

              Keeps Drinks Hot For

              12 Hours

              Highlight Features

              weight of 1.21 pounds

              12 hours for hot and 24 hours for cold

              newly designed chug lid

              For hiking, the MIRA 25 Oz Insulated Metal Water Bottle is hard to beat.

              Best For Tea: Bear Grylls Triple Wall Vacuum Insulated Water Bottle

              Bear Grylls Triple Wall Vacuum Insulated Water Bottle
              Bear Grylls Triple Wall Vacuum Insulated Water Bottle
              9.2Outstanding
              Pros
              • Ultra-lightweight for easier carrying - Weight: 9.6 ounces
              • Perfect for keeping hot/cold tea – 12 hours for hot tea, 24 hours for cold & odor-resistant
              Cons
              • The top is not drop-proof

              If all you need is a human-safe flask to retain the heat of your tea while you’re going to work/school/hiking or other activities with a travel time of at least 30 minutes, this option even gives you more.

              It can keep hot tea for up to 12 hours and is available in two size choices: 600 and 950 ml.

              While the body is built to resist impacts efficiently, it is feather-light – around 20% lighter than other similar counterparts. Weight: 9.6 ounces, equivalent to 272 grams.

              The biggest bonus is it doesn’t retain odors or flavors.

              Bear Grylls Triple Wall Vacuum Insulated Water Bottle Specifications

              Weight

              9.6 oz. (272 g)

              Size

              600ml & 950ml.

              Lid Type

              screw-top lid

              Keeps Drinks Hot For

              12 Hours

              Highlight Features

              Weight: 9.6 ounces

              12 hours for hot tea, 24 hours for cold & odor-resistant

              For those who are looking for the best thermos flask for keeping tea hot while on the go, this is it.

              How To Choose The Best Thermos Flask For Keeping Drinks Hot?

              Your Purposes

              This is key to figure out the size of flasks and the number of hours you want them to keep your beverages hot/cold.

              For example, if you just want something to carry hot tea during 30 minutes of transporting to your work/school, your go-to thermos flask doesn’t need to feature the longest thermos duration. The contrary to hiking/camping trips.

              As your time spent outdoors will be longer, the flask’s performance should be better.

              Most of the thermos flasks at the current commonly feature time ranges for keeping drinks hot within 8 to 24 hours. Some have different thermos duration for cold and hot.

              For instance, the Bear Grylls Triple Wall Vacuum Insulated Water Bottle in our list offers 12 hours for hot drinks and 24 hours for cold.

              Mouth and Lid Design

              This features results in two things:

              • Ease of filling, especially when you want to add some ice into it
              • Ease of maintenance

              Therefore, the mouth design of a thermos flask should be reasonably wide. There are some modern designs nowadays even incorporate twist and pour spouts to remove completely the stopper.

              For outdoor activities like camping, backpacking, or hiking, choosing a thermos flask that has an integrated cup and other one-handed operation features will come in handy.

              Which Brands Make The Best Thermos Flask For Keeping Drinks Hot?

              Stanley

              Standley was founded in 1913 by inventor William Stanley Jr., who forever changed the way hot drinks were consumed.

              With a rich 100+ year history plus non-stop self-pushing to bring timeless, yet modern, solutions to today's outdoor adventure, no doubt when they’re the leader in this realm now.

              Thermoflask

              As its name implies, this company is specialized in designing and manufacturing thermos flasks. They’re reliable because all the products are made of food-grade 18/8 stainless steel with a durable powder-coated finish. The plastic lids are BPA-Free.

              MIRA

              At MIRA, you have a wide range of thermos flask options in different sizes, designs, and colors to choose from. Their products are already tested for safety, durability, and performance.

              FAQs

              Should I get a thermos?

              If you want a reusable travel mug that can also keep your hot drinks while on the go, then a thermos is a should.

              Can you put milk in a thermos?

              Yes, you can. A thermos works its best in keeping beverages’ heat.

              Is stainless steel flask safe?

              As long as it is food-graded then yes, the stainless-steel flask is safe to use.

              Is an old thermos safe?

              Drinking from any old glass thermos isn’t dangerous. This material is also the top option for keeping foods/beverages the longest time, however, it’s prone to break so manufacturers use plastic or stainless-steel instead.

              Why is a thermos flask good at keeping drinks hot as well as cold?

              It’s because the thermos flask is a vacuum unit, which can minimize the heat transfer due to radiation and conduction.

              Conclusion

              All that now stands between you and hot drinks is your final choice and a good thermos flask. It doesn’t need to be the option that can keep a brew hot drink the longest time but should meet your own needs – whether for long or short trips.

              We’re proud of the work we have done to hash out all the best thermos flasks for keeping drinks hot and honored to be a small part of your decision-making process.

              Bryan Listor
              Bryan Listor

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